Digital thermometer circuit


Posted on Feb 7, 2014

A very precise digital thermometer with LM35 probe (0, 1 degree of freedom). The circuit has two adjustments. One of them, R5, adjusts the displays to 0. To perform this, we have to connect the extreme part of R4 (that goes to the temperature probe) to the ground and we turn R5 until we see 0:0:0. Afterwards, we connect the probe LM35 to terminals


Digital thermometer circuit
Click here to download the full size of the above Circuit.

2 and 3 which are marked in the circuit. This is how we Then we measure the values between the non connected terminal, which is the out of the probe, and the ground, with the tester, adjusted to 1 Volt (bottom of the scale). The tension which is shown represents the temperature in the room. For example, if it marks 0. 236, the temperature is 23, 6 C. When we have the measure, we connect the terminal 1 of the probe to the circuit and we adjust R7 until it gives us the value of what we had measured.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Discrete component motor direction controller
    14MHz SSB 10mW transceiver
    Overvoltage protection for logic
    Baby Monitor Circuit
    Broadcast Band Rf Amplifier Circuit
    mixer translates multiple standards
    dac en
    Momentary Switch Teamed With Latching Relay
    Lithium-Polymer Peak Charger
    Netzer Playground
    Digital Circuits
    USB RGB LED VU Meter
    Single-Shot Auto-Charge Flash Circuit
    Closed loop power control with a single speed
    Single-phase motor automatic intermittent operation control circuit



    Top